High-voltage gas-blast puffer type circuit-breaker

Abstract

A gas-blast puffer type SF 6 circuit-breaker exhibiting essentially features as follows: Dual-blast nozzle arrangement wherein a first nozzle being made of electrically conductive material, and a second nozzle being made of electrically insulating material; a movable compression cylinder of electrically insulating material bearing a tube-shaped contact piece intended for carrying mainly continuous current; a nozzle-shaped arcing contact piece connected mechanically rigid and electrically suitable for carrying current with said movable contact piece. The further improvement to said inventive concept characterize: A first compression cylinder of electrically insulating material surrounding temporarilly the nozzle arrangement and being engaged with a first fixed piston; a second compression cylinder of metal being engaged with a temporarilly catchable compression piston, both cylinders and pistons establishing a first and a second volume, said volumes communicating pneumatically with each other in a controllable manner, representing during an opening operation a high-performance gas compression system.

What I claim as my invention and desire to secure by Letters Patent is: 
     
       1. A gas-blast puffer-type circuit-breaker comprising: dual-blast nozzle arrangement, wherein two nozzles facing each other in a fixed axial distance;   said dual-blast nozzles, each of them ending in a gas flow absorbing volume, being temporarilly surrounded by a movable single compression cylinder;   separated contact pieces for carrying continuous and arc current respectively;   the improvement of said circuit-breaker characterizing:   dual-blast nozzle arrangement, wherein a first nozzle (5) being made of electrically conducting material whereas a second nozzle (6) being made of electrically insulating material;   a movable compression cylinder (3) of electrically insulating material bearing a contact piece (23) being intended for carrying continuous current;   an arcing contact piece (8) being connected mechanically rigid and suitable for carrying electrical currents with said movable contact piece (23).   
     
     
       2. The invention according to claim 1, wherein a piston (4) being fixed on a gas pipe (9) next to the second nozzle (6) made of electrically insulating material.   
     
     
       3. The invention according to claim 1, wherein a variable first spacial unit (1) and a variable second spatial unit (33) being mechanically connected, said spatial units having the same inner diameter and different outer diameters;   said variable spatial units communicating pneumatically with each other in a controllable manner, said pneumatical communication (32) being arranged outside of a fixed partition (4) separating said spatial units.   
     
     
       4. The invention according to claim 3, wherein said variable first spatial unit (1) being established by a first compression cylinder (3) being made of electrically insulating material, being engaged with a first piston (4) being made partially of insulating material;   said variable second spatial unit (33) being established by a second compression cylinder (34) being made of metal, being engaged with a second movable piston (35) of metal, being arranged temporarilly catchable.   
     
     
       5. The invention according to claim 3, wherein on said first compression cylinder (3) being attached a tube shaped electrically conducting member (23), between said member and the outer surface of said compression cylinder being arranged a channel like hollow space (32), connecting the spatial units (1,33) pneumatically, in said hollow space being positioned a check valve.   
     
     
       6. The invention according to claim 4, wherein the clear distance between a cap (36) of the second compression cylinder (34) and the second catchable piston (35) being larger compared with the overlapping length between the movable arcing contact piece (8) and the first nozzle (5) made of electrically conducting material.